1) It's cold at night so you (must / can) pack a blanket. 2) the campsite is next to a lake so we (has to/can) go swiming.
3) there are no tents at the campsite so you (don't have to/have to) bring your own.
4) you (can't/ mustn't) drop litter in the nature reserve.
5) it's hot here. (Must/Can) you open the window, please?
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